Currently the global energy demand continues to increase and the conventional energetic resources cannot feed an energetic system in equilibrium with the environment. Technological innovation to achieve the increase of efficiency and the energy saving of current energetic models, both production and consumption, with the evolution of the use of renewable energy resources technologies, are the keys to success for a sustainable future. The main objective of this project is to design and analyze the viability of a solar cooling system by absorption, for a representative office building located in Barcelona. This design will be implemented as an action to improve one existing conventional air conditioning installation, with two aims; to decrease the energy consumptions of the equipment and to increase the system efficiency, without compromising comfort conditions. The main elements of the installation are; one conventional natural gas boiler, one air chiller and two storage tanks, one for each temperature network. To get a system with solar cooling, a simple effect absorption machine, a field of vacuum tube collectors and one extra storage tank for the collectors will be implemented. This document exposes the inicial conditions of the project, the description and the study of all the elements that are needed in a solar cooler system, the software that has been used to model mathematically the installation and the environmental conditions, the strategies and the equations that have been used, and finally, the criteria that has been used to analyze the economic and energetic viability of this project.